Antagonistic Potential of Phosphate Solubilizing Bacteria (Bacillus spp.) from Peat Soil against Erwinia sp. (BP1) from the Leaves Zig-Zag Spots Symptoms Disease of the Pontianak Siamese Citrus Plants (Citrus nobilis var. microcarpa)
Keywords:
Antagonist test, Erwinia sp., Phosphate-solubilizing bacteria, Siamese lime leafAbstract
The Pontianak Siamese orange (Citrus nobilis var. microcarpa) is one of the horticultural crops that is a leading commodity in the West Kalimantan area. However, in recent years, the production of Siamese oranges has decreased. One of the causes of the decline in the production of Siamese orange plants is the presence of diseases caused by bacteria. The Erwinia sp. bacteria, as the test pathogenic bacteria, were isolated from orange leaves with symptoms of zig-zag spots. Diseases in plants can be controlled using rhizosphere bacteria as biological agents. The phosphate-solubilising bacteria used as biological control agents in this research are rhizosphere bacteria originating from forest peat soil in Kubu Raya Regency, West Kalimantan. This research used a Completely Randomized Design (CRD) with five treatments. The in vitro antagonist test uses the dual culture method. The results showed that all phosphate-solubilising bacteria originating from peat soil Bacillus sp. (SGB1), Bacillus sp. (SGB2), and Bacillus sp. (SGB3) had antagonistic potential against the bacteria Erwinia sp. BP1.
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